Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

P0303, P0306 codes - How concerned should I be?

greenboxster

By greenboxster
in 996 TT, 996 TT S, 996 GT2

 Share

Recommended Posts

greenboxster Member

greenboxster

Posted
Posted

I searched for various permutations of the P030x misfire code, but didn't come up with any advice regarding the seriousness.

I have a 2003 996TT X50 that I drove up to Virginia for the 13 Hour race (unfortunately in an Integra, not in a Porsche :lol: ). After a blustery, rainy Saturday night, I packed up on Sunday morning and upon startup got a check engine light. Since it was not flashing (and I had no good options to have someone look at it) I drove cautiously back home to Atlanta and plugged in the Durametric. There was a misfire on cylinders 3 and 6.

I cleared the code and it has not yet reappeared. How concerned should I be? What could have caused a misfire on both "front" cylinders? I replaced plugs and coil packs about a month ago, but the car has probably 1,000 miles on it since then.

My car is always garaged, but not a garage queen since she is my daily driver (and occasional camping vehicle :D). Did the rain cause the misfire?

Link to comment
Share on other sites
greenboxster Member

greenboxster

Posted
  • Author
Posted
You are having misfires in cylinder 3 and cylinder 6. Check the electrical connectors, coil packs, and spark plugs in that order.

Because it happened in the rain - my guess would be bad connections or cracked coil packs.

Thanks, Loren. I was very gentle installing the new plugs and packs last month and the "3" and "6" coil pack connectors were the easiest to click on the packs. I don't really want to tear everything back apart, but I don't know if I am being foolish clearing the code and waiting for it to reappear - or hopefully not reappear!

Might this be a one-time fluke? Am I taking a risk waiting for the code to reappear?

Thanks,

Steve

Link to comment
Share on other sites
  • 1 month later...
saved4it Member

saved4it

Posted
Posted

Interesting! I just drove 350 miles in hard rain, had the car parked in it for a few hours, and also got P0303 and P0306 (same cylinders). I have 60500 miles and plan on doing my own service this Christmas break. I went ahead and ordered the coil packs to change them out while I'm down there doing the plugs.

post-41322-1261115168_thumb.png

Link to comment
Share on other sites
  • 2 months later...
benaslan Member

benaslan

Posted
Posted

You guys have any changes since these posts? Any re-occurrence? Same thing happened to me yesterday. Drove a bit, parked, had heavy rain... when I got back in the car and started it up, I got the check engine light and it's cylinders 3 & 6 misfiring. I noticed no signs when I started it up, drove just like it should. Planning on clearing the codes and seeing what happens, but I guess it may be the coils. Plugs are new, dealer had the engine out for some trans work a few months ago and changes the plugs then.

Could they have done anything? I don't want to bring it back there again. Paid WAY too much and the only reason I brought it there was that I expected the work I had done be paid by warrantly, but they denied it. No longer on warranty now.

Thanks,

Ben

Link to comment
Share on other sites
  • 2 weeks later...
benaslan Member

benaslan

Posted
Posted

Since I had filled up the day before, my thought was that mine was either cause by a bad fill-up, water getting in the fuel, or crud build-up on my injectors. So, once empty, I filled up with a bottle of techron and gas and went WOT as much as possible over the last week and I've had no problems. Hopefully I blew whatever it was out of there. Been running great.

Link to comment
Share on other sites
greenboxster Member

greenboxster

Posted
  • Author
Posted

You guys have any changes since these posts? Any re-occurrence? Same thing happened to me yesterday. Drove a bit, parked, had heavy rain... when I got back in the car and started it up, I got the check engine light and it's cylinders 3 & 6 misfiring.

Ben -

I haven't had any more codes, but the heaviest precip I have driven through recently has been snow. eek.gif Seems like a one-off occurrence.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.